[hidden]{display:none!important}
:root{--navy:#04123f;--blue:#0a5cff;--aqua:#13c39a;--aq2:#2de2c0;--ink:#0b1f5c;--mut:#4a5878;--bg:#f3f7ff}
*{box-sizing:border-box}body{margin:0;font-family:"Noto Sans",system-ui,-apple-system,Segoe UI,Roboto,sans-serif;background:var(--bg);color:var(--ink)}
a{color:var(--blue)}h1,h2,h3{margin:0;line-height:1.15}.muted{color:var(--mut)}.small{font-size:.88rem}
.script{font-family:"Kaushan Script",cursive}
.ee-demo{background:#ffd54a;color:#3a2c00;text-align:center;font-size:.85rem;font-weight:700;padding:.45rem 1rem}
.a-pill{display:inline-block;border:1.5px solid var(--aqua);color:#0b8a6c;border-radius:999px;padding:.3rem .9rem;font-size:.78rem;font-weight:800;letter-spacing:.06em;text-transform:uppercase}
.a-btn{display:inline-flex;justify-content:center;align-items:center;gap:.5rem;border:0;border-radius:12px;padding:.9rem 1.3rem;font-weight:800;font-size:1rem;cursor:pointer;color:#fff;background:linear-gradient(135deg,var(--blue),#0638b8);box-shadow:0 10px 24px -10px #0a5cffaa;font-family:inherit}
.a-btn:disabled{opacity:.45;cursor:default}.a-btn.ghost{background:#fff;color:var(--blue);border:2px solid #cddcff;box-shadow:none}
.a-link{background:none;border:0;color:var(--blue);font-weight:700;cursor:pointer;padding:.4rem;font-family:inherit}
.a-err{min-height:1.2em;color:#c62828;font-weight:600;margin:.2rem 0}.a-ok{color:#0b8a6c;font-weight:600}
/* login */
.a-login{min-height:100vh;background:radial-gradient(60% 60% at 80% 20%,#2f7bff55,transparent 70%),linear-gradient(150deg,#04123f,#0638b8 60%,#0a5cff)}
.login-wrap{min-height:100vh;display:grid;grid-template-columns:1fr 460px;align-items:center;gap:2rem;max-width:1100px;margin:0 auto;padding:2rem}
.login-art{position:relative;align-self:end;text-align:center}.login-art img{max-width:420px;width:100%;height:auto;filter:drop-shadow(0 20px 40px #0008)}
.login-art p{position:absolute;left:8%;top:22%;color:#fff;font-size:2.2rem;transform:rotate(-8deg);border-bottom:3px solid var(--aq2)}
.login-card{background:#fff;border-radius:24px;padding:2.2rem 2rem;display:grid;gap:.75rem;box-shadow:0 30px 70px -20px #000a}
.login-logo{width:170px;height:auto;filter:drop-shadow(0 2px 4px #0b1f5c33);background:var(--navy);border-radius:12px;padding:.5rem .8rem}
.login-card h1{font-size:1.7rem}
.login-card label{display:grid;gap:.35rem;font-weight:700;font-size:.9rem}
.login-card input{border:1.5px solid #cddcff;border-radius:12px;padding:.85rem 1rem;font-size:1rem;font-family:inherit}
.login-card input:focus{outline:3px solid #0a5cff33;border-color:var(--blue)}
/* top */
.a-top{position:sticky;top:0;z-index:5;display:flex;justify-content:space-between;align-items:center;padding:.7rem clamp(1rem,5vw,3rem);background:var(--navy)}
.a-logo img{height:40px;width:auto;display:block}
.a-top nav{display:flex;gap:1rem;align-items:center}.a-top nav a{color:#fff;font-weight:700;text-decoration:none}
.a-out{background:#ffffff1a;color:#fff;border:1px solid #ffffff33;border-radius:999px;padding:.45rem 1rem;font-weight:700;cursor:pointer;font-family:inherit}
.a-main{max-width:1200px;margin:0 auto;padding:1.8rem clamp(1rem,4vw,2.5rem) 3rem}
.a-hero{display:grid;grid-template-columns:1fr 220px;align-items:end;gap:1rem;background:linear-gradient(120deg,#06163f,#0a2a8a 55%,#0a5cff);color:#d6e2ff;border-radius:24px;padding:2rem 2rem 0;overflow:hidden;margin-bottom:2rem}
.a-hero>div{padding-bottom:2rem}.a-hero h1{color:#fff;font-size:clamp(1.6rem,3.4vw,2.4rem);margin:.6rem 0}.a-hero .a-pill{color:var(--aq2);border-color:var(--aq2)}
.a-hero img{width:100%;height:auto;display:block}
.a-h2{font-size:1.4rem;margin-bottom:1rem}
.a-courses{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:1.2rem}
.a-course{display:flex;flex-direction:column;gap:.5rem;background:#fff;border:1px solid #dbe5fb;border-top:5px solid var(--blue);border-radius:20px;padding:1.5rem;text-decoration:none;color:inherit;box-shadow:0 14px 30px -20px #0b1f5c66;transition:transform .3s,box-shadow .3s}
.a-course.c-calculo{border-top-color:var(--aqua)}
.a-course:hover{transform:translateY(-6px);box-shadow:0 22px 40px -18px #0a5cff77}
.a-ic{width:52px;height:52px;border-radius:14px;display:grid;place-items:center;background:#eaf1ff;color:var(--blue)}.c-calculo .a-ic{background:#e6faf4;color:#0b8a6c}.a-ic svg{width:28px;height:28px}
.a-course p{color:var(--mut);margin:0}
.a-meta{list-style:none;padding:0;margin:.3rem 0;display:flex;flex-wrap:wrap;gap:.4rem}.a-meta li{background:var(--bg);border-radius:999px;padding:.25rem .7rem;font-size:.8rem;font-weight:700;color:var(--ink)}
.a-go{margin-top:auto;font-weight:800;color:var(--blue)}
.a-empty{background:#fff;border:1px dashed #b9cbf5;border-radius:20px;padding:2rem;text-align:center}
.a-help{margin-top:2rem;text-align:center;color:var(--mut)}
/* course */
.a-back{display:inline-block;margin-bottom:.8rem;font-weight:700;text-decoration:none}
.a-course-page h1{font-size:clamp(1.5rem,3vw,2.2rem)}
.a-mods{display:flex;gap:.5rem;overflow-x:auto;padding:1rem 0;scrollbar-width:thin}
.a-mods button{flex:none;border:1.5px solid #cddcff;background:#fff;color:var(--ink);border-radius:999px;padding:.55rem 1rem;font-weight:700;cursor:pointer;font-family:inherit}
.a-mods button.on{background:var(--blue);color:#fff;border-color:var(--blue)}
.a-player-wrap{display:grid;grid-template-columns:1fr 340px;gap:1.5rem;align-items:start}
.a-frame{position:relative;aspect-ratio:16/9;background:#000;border-radius:18px;overflow:hidden;box-shadow:0 20px 40px -20px #0b1f5c99}
.a-frame iframe{position:absolute;inset:0;width:100%;height:100%;border:0}
.a-player h2{font-size:1.3rem;margin:1rem 0}
.a-nav{display:flex;justify-content:space-between;gap:.8rem;flex-wrap:wrap}
.a-mat{margin-top:1.5rem;background:#fff;border:1px solid #dbe5fb;border-radius:16px;padding:1.2rem;display:grid;gap:.6rem}
.a-pdf{display:flex;justify-content:space-between;align-items:center;gap:.6rem;text-align:left;background:var(--bg);border:1px solid #dbe5fb;border-radius:12px;padding:.8rem 1rem;font-weight:700;color:var(--ink);cursor:pointer;font-family:inherit;font-size:.95rem}
.a-pdf span{background:#c62828;color:#fff;border-radius:6px;padding:.1rem .45rem;font-size:.72rem}
.a-list{background:#fff;border:1px solid #dbe5fb;border-radius:18px;padding:1rem;position:sticky;top:76px;max-height:calc(100vh - 100px);overflow:auto}
.a-list h3{font-size:1rem;padding:.3rem .4rem .8rem}
.a-list ol{list-style:none;margin:0;padding:0;display:grid;gap:.3rem}
.a-list button{width:100%;display:flex;gap:.7rem;align-items:flex-start;text-align:left;background:none;border:0;border-radius:10px;padding:.6rem;font-size:.9rem;color:var(--ink);cursor:pointer;font-family:inherit}
.a-list button span{flex:none;width:26px;height:26px;border-radius:50%;display:grid;place-items:center;background:var(--bg);font-weight:800;font-size:.78rem}
.a-list li.ok button span{background:var(--aqua);color:#fff}
.a-list li.on button{background:#eaf1ff;font-weight:700}.a-list li.on button span{background:var(--blue);color:#fff}
@media(max-width:900px){.login-wrap{grid-template-columns:1fr}.login-art{display:none}.a-player-wrap{grid-template-columns:1fr}.a-list{position:static;max-height:none}.a-hero{grid-template-columns:1fr 130px;padding:1.5rem 1.3rem 0}}
@media(max-width:520px){.a-hero{grid-template-columns:1fr}.a-hero img{display:none}.a-hero>div{padding-bottom:1.5rem}.login-card{padding:1.6rem 1.3rem}.a-nav .a-btn{flex:1}}